Six filters are available.

Gaussian:
LP: lowpass filter of order 'order'; passes frequencies lower than 'cutoff'
BP: bandpass filter of order 'order'; passes frequencies between the lower and upper cutoffs.
HP: highpass filter of order 'order'; passes frequencies higher than 'cutoff'

Butterworth:
LP: lowpass filter of order 'order'; passes frequencies lower than 'cutoff'
BP: bandpass filter of order 'order'; passes frequencies between the lower and upper cutoffs.
HP: highpass filter of order 'order'; passes frequencies higher than 'cutoff'

Note: all 'cutoff' frequencies are specified in waves per FOV (field of view), referenced to the X-axis